/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.dolphinscheduler.common.utils;

import org.apache.dolphinscheduler.common.Constants;
import org.apache.http.HttpEntity;
import org.apache.http.client.config.AuthSchemes;
import org.apache.http.client.config.CookieSpecs;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
import java.util.Arrays;
/**
 * http utils
 */
public class HttpUtils {


	public static final Logger logger = LoggerFactory.getLogger(HttpUtils.class);

	private HttpUtils() {

	}

	public static CloseableHttpClient getInstance(){
		return HttpClientInstance.httpClient;
	}

	private static class HttpClientInstance{
		private static final CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(cm).setDefaultRequestConfig(requestConfig).build();
	}


	private static PoolingHttpClientConnectionManager cm;

	private static SSLContext ctx = null;

	private static SSLConnectionSocketFactory socketFactory;

	private static RequestConfig requestConfig;

	private static Registry<ConnectionSocketFactory> socketFactoryRegistry;

	private static X509TrustManager xtm = new X509TrustManager() {
		@Override
		public void checkClientTrusted(X509Certificate[] chain, String authType) {
		}

		@Override
		public void checkServerTrusted(X509Certificate[] chain, String authType) {
		}

		@Override
		public X509Certificate[] getAcceptedIssuers() {
			return null;
		}
	};

	static {
		try {
			ctx = SSLContext.getInstance(SSLConnectionSocketFactory.TLS);
			ctx.init(null, new TrustManager[] { xtm }, null);
		} catch (NoSuchAlgorithmException e) {
			logger.error("SSLContext init with NoSuchAlgorithmException", e);
		} catch (KeyManagementException e) {
			logger.error("SSLContext init with KeyManagementException", e);
		}
		socketFactory = new SSLConnectionSocketFactory(ctx, NoopHostnameVerifier.INSTANCE);
		/** set timeout、request time、socket timeout */
		requestConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.IGNORE_COOKIES)
				.setExpectContinueEnabled(Boolean.TRUE)
				.setTargetPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM, AuthSchemes.DIGEST))
				.setProxyPreferredAuthSchemes(Arrays.asList(AuthSchemes.BASIC))
				.setConnectTimeout(Constants.HTTP_CONNECT_TIMEOUT).setSocketTimeout(Constants.SOCKET_TIMEOUT)
				.setConnectionRequestTimeout(Constants.HTTP_CONNECTION_REQUEST_TIMEOUT).setRedirectsEnabled(true)
				.build();
		socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
				.register("http", PlainConnectionSocketFactory.INSTANCE).register("https", socketFactory).build();
		cm = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
		cm.setDefaultMaxPerRoute(60);
		cm.setMaxTotal(100);

	}



	/**
	 * get http request content
	 * @param url url
	 * @return http get request response content
	 */
	public static String get(String url){
		CloseableHttpClient httpclient = HttpUtils.getInstance();

		HttpGet httpget = new HttpGet(url);
		return getResponseContentString(httpget,httpclient);
    }

    /**
     * get http response content
     *
     * @param httpget    httpget
     * @param httpClient httpClient
     * @return http get request response content
     */
    public static String getResponseContentString(HttpGet httpget, CloseableHttpClient httpClient) {
	String responseContent = null;
	CloseableHttpResponse response = null;
	try {
	    response = httpClient.execute(httpget);
	    // check response status is 200
	    if (response.getStatusLine().getStatusCode() == 200) {
		HttpEntity entity = response.getEntity();
		if (entity != null) {
		    responseContent = EntityUtils.toString(entity, Constants.UTF_8);
		} else {
		    logger.warn("http entity is null");
		}
	    } else {
		logger.error("http get:{} response status code is not 200!", response.getStatusLine().getStatusCode());
	    }
	} catch (IOException ioe) {
	    logger.error(ioe.getMessage(), ioe);
	} finally {
	    try {
		if (response != null) {
		    EntityUtils.consume(response.getEntity());
		    response.close();
		}
	    } catch (IOException e) {
		logger.error(e.getMessage(), e);
	    }
	    if (!httpget.isAborted()) {
		httpget.releaseConnection();
		httpget.abort();
	    }

	}
	return responseContent;
    }

}
